iOS开发基础130-视频录制上传

视频录制并上传至服务器涉及多个步骤，包括配置AVCaptureSession、处理视频数据以及上传文件。这需要引入AVFoundation框架和一些其他的工具。

1. 配置AVCaptureSession

我们需要配置AVCaptureSession来处理视频捕捉，通过设置视频输入和输出，配置录制的参数。

Setup VideoCaptureViewController.h

在.h文件中，定义必要的属性和方法：

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>

@interface VideoCaptureViewController : UIViewController

@property (nonatomic, strong) AVCaptureSession *captureSession;
@property (nonatomic, strong) AVCaptureDeviceInput *videoInput;
@property (nonatomic, strong) AVCaptureMovieFileOutput *movieOutput;
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *previewLayer;
@property (nonatomic, strong) NSURL *outputFileURL;

@end

Setup VideoCaptureViewController.m

在.m文件中，配置捕捉会话及其输入和输出，并处理预览和录制控制：

#import "VideoCaptureViewController.h"

@implementation VideoCaptureViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupCaptureSession];
    [self setupPreviewLayer];
    [self.captureSession startRunning];
}

- (void)setupCaptureSession {
    self.captureSession = [[AVCaptureSession alloc] init];
    self.captureSession.sessionPreset = AVCaptureSessionPresetHigh;

    // 设置视频输入
    AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if (!videoDevice) {
        NSLog(@"No video device found");
        return;
    }
    
    NSError *error = nil;
    self.videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&error];
    if (error) {
        NSLog(@"Error: %@", error.localizedDescription);
        return;
    }
    
    if ([self.captureSession canAddInput:self.videoInput]) {
        [self.captureSession addInput:self.videoInput];
    }

    // 设置麦克风输入
    AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
    AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:&error];
    if (error) {
        NSLog(@"Error: %@", error.localizedDescription);
        return;
    }
    
    if ([self.captureSession canAddInput:audioInput]) {
        [self.captureSession addInput:audioInput];
    }

    // 设置视频输出
    self.movieOutput = [[AVCaptureMovieFileOutput alloc] init];
    if ([self.captureSession canAddOutput:self.movieOutput]) {
        [self.captureSession addOutput:self.movieOutput];
    }
}

// 设置视频预览层
- (void)setupPreviewLayer {
    self.previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession];
    self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    self.previewLayer.frame = self.view.bounds;
    [self.view.layer insertSublayer:self.previewLayer atIndex:0];
}

// 开始录制视频
- (void)startRecording {
    NSString *outputFileName = [[NSUUID UUID] UUIDString];
    NSString *outputFilePath = [NSTemporaryDirectory() stringByAppendingPathComponent:[outputFileName stringByAppendingPathExtension:@"mov"]];
    self.outputFileURL = [NSURL fileURLWithPath:outputFilePath];

    [self.movieOutput startRecordingToOutputFileURL:self.outputFileURL recordingDelegate:self];
}

// 停止录制视频
- (void)stopRecording {
    [self.movieOutput stopRecording];
}

#pragma mark - AVCaptureFileOutputRecordingDelegate

- (void)captureOutput:(AVCaptureFileOutput *)output didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error {
    if (error) {
        NSLog(@"Error: %@", error.localizedDescription);
    } else {
        NSLog(@"Video recording finished: %@", outputFileURL);
        // 可以在这里处理视频上传
        [self uploadVideoFile:outputFileURL];
    }
}

@end

2. 上传视频文件到服务器

假设服务器端点为https://example.com/upload，我们可以使用NSURLSession来上传视频文件。

@implementation VideoCaptureViewController

// 上传视频文件至服务器
- (void)uploadVideoFile:(NSURL *)fileURL {
    NSString *urlString = @"https://example.com/upload";
    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPMethod:@"POST"];
    
    NSString *boundary = [NSString stringWithFormat:@"Boundary-%@", [[NSUUID UUID] UUIDString]];
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", boundary];
    [request setValue:contentType forHTTPHeaderField:@"Content-Type"];
    
    NSMutableData *body = [NSMutableData data];
    
    NSData *videoData = [NSData dataWithContentsOfURL:fileURL];
    if (!videoData) {
        NSLog(@"Failed to create video data.");
        return;
    }
    
    // Append video data with boundary
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"file\"; filename=\"%@\"\r\n", fileURL.lastPathComponent] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Type: video/quicktime\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:videoData];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    
    request.HTTPBody = body;
    
    NSURLSession *session = [NSURLSession sharedSession];
    NSURLSessionDataTask *uploadTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
        if (error) {
            NSLog(@"Error uploading video file: %@", error.localizedDescription);
        } else {
            NSLog(@"Video file uploaded successfully with response: %@", response);
        }
    }];
    
    [uploadTask resume];
}

@end

详细的作用说明

• -setupCaptureSession: 创建并配置AVCaptureSession实例，添加视频和音频输入，以及视频输出。
• -setupPreviewLayer: 创建并配置用于实时预览的AVCaptureVideoPreviewLayer，并将其添加到视图层次中。
• -startRecording: 为视频录制生成唯一的输出文件URL，并开始录制。
• -stopRecording: 停止视频录制。
• captureOutput:didFinishRecordingToOutputFileAtURL:fromConnections:error:: 视频录制结束的回调方法，在这里处理视频上传。
• -uploadVideoFile:: 创建上传请求并使用NSURLSession将录制的视频文件上传到服务器。

总结

通过以上步骤，我们完成了视频录制和上传至服务器的全部过程。该示例涵盖了从配置和启动视频捕捉会话、处理视频录制回调，到使用NSURLSession上传视频文件的所有细节。通过进一步调整，这个示例可以扩展和应用到各种场景中，比如视频聊天应用、视频上传服务等。